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<head>
	<meta charset="UTF-8" />
	<title>Document</title>
</head>

<body>
	<script type="text/javascript">
		let arr1 = [1, 3, 5, 7, 9]
		let arr2 = [2, 4, 6, 8, 10]
		console.log(...arr1); //展开一个数组
		let arr3 = [...arr1, ...arr2]//连接数组

		//在函数中使用
		function sum(...numbers) {
			console.log(numbers);
			return numbers.reduce((sum, item) => { return sum += item }, 0)
		}
		console.log(sum(1, 2, 3, 4, 5));


		//构造字面量对象时使用展开语法
		let person = { name: 'tom', age: 18 }
		let person2 = { ...person } // 2.复制一个对象
		//console.log(...person); //1.报错，展开运算符不能展开对象
		person.name = 'jerry'
		console.log(person2);
		console.log(person);

		//合并+覆盖修改
		let person3 = { ...person, name: 'jack', address: "地球" }
		console.log(person3);

	</script>
</body>

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